wiki: clarify origin of szl #85
Description
The current wiki entry for tips on compiling and flashing states:
szl.elf-- A bootloader supplied by the M-Labs nix script (Britton can't track down it's origin.)
The M-Labs instructions linked later in the wiki entry now mention:
szl.elf (an open-source bootloader for Zynq written by M-Labs, used in ARTIQ in place of Xilinx’s FSBL).
I suggest to update this line to reflect the M-Labs documentation.